doc(Select): add generic type documentation

[ArgoZhang]

Link issues

fixes #6071

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Bug Fixes:

• Use null-conditional operator when rendering context.Text in SelectGeneric DisplayTemplate to prevent null reference exceptions

[sourcery-ai]

Reviewer's Guide

Updated SelectGeneric sample to add null-safety in the DisplayTemplate by using the null-conditional operator on context.

File-Level Changes

Change	Details	Files
DisplayTemplate now safely handles null context	Replaced @context.Text with @context?.Text in the DisplayTemplate	src/BootstrapBlazor.Server/Components/Samples/SelectGenerics.razor

Assessment against linked issues

Issue	Objective	Addressed	Explanation
#6071	Add sample code for the Select component demonstrating the use of generic types.	✅

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (003b3ff) to head (2ff628b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #6072   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          701       701           
  Lines        30944     30944           
  Branches      4376      4376           
=========================================
  Hits         30944     30944           

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[sourcery-ai]

Hey @ArgoZhang - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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